Have you looked into a Thunderbolt display
I don't know which 30" Dell monitor he has, but I have a Dell U3011 at home and an Apple ThunderBolt display at work. The Dell U3011 is clearly the superior monitor to me. The TB display had potential to be great combined with a TB-capable laptop (I use it with a rMBP), but it lacks an audio out and is plagued with USB related problems, so it still doesn't deliver on the promise of having only one cable to plug in (I still plug in my headphones and a USB external drive directly into the laptop). The U3011 has more pixels, is non-glossy, and has more input options. I'm hoping some day that 3rd party Thunderbolt hubs make Thunderbolt a more useful technology.
As for the Mac Pro, I'm torn about whether or not I'm going to get another Mac Pro. I have a 2007 Mac Pro that is still holding it's own thanks to graphics card, RAM, and CPU upgrades as well as the hack to get Mountain Lion to work. I've been disappointed with Apple's lack of support for upgrades and dropping OS X support, though I've managed to workaround their lack of support with unsupported upgrades/hacks. If the new Mac Pro takes a step backwards and is even less upgradable, I would be hard-pressed to get one. What I want is more upgradability and a promise for more support in upgrades, but I don't see Apple doing that.
As for what I actually want. I expect ThunderBolt support of some kind. I want more drive bays, hopefully keeping some of these as 3.5" because I don't see 3TB and larger drives appearing in a 2.5" size any time soon, and I prefer internal over external.
I don't care about a smaller form factor. The Mac Pro sits under my desk with plenty of room to spare, and I rarely move it. If it has to stay the same size (or be even larger) to contain the extra drive bays I want, and to have large enough heatsinks and fans (and with enough room for good airflow) to keep it quiet, that is fine with me. With the absence of the XServe, I can understand those using Mac Pros as servers wanting a small, more rack-friendly form factor though.